mirror of
https://github.com/hwchase17/langchain
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105 lines
3.0 KiB
Python
105 lines
3.0 KiB
Python
from typing import TYPE_CHECKING, Dict, List, Union
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from langchain_community.document_loaders.unstructured import UnstructuredFileLoader
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if TYPE_CHECKING:
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from chm import chm
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class UnstructuredCHMLoader(UnstructuredFileLoader):
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"""Load `CHM` files using `Unstructured`.
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CHM means Microsoft Compiled HTML Help.
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Examples
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--------
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from langchain_community.document_loaders import UnstructuredCHMLoader
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loader = UnstructuredCHMLoader("example.chm")
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docs = loader.load()
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References
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----------
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https://github.com/dottedmag/pychm
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http://www.jedrea.com/chmlib/
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"""
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def _get_elements(self) -> List:
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from unstructured.partition.html import partition_html
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with CHMParser(self.file_path) as f: # type: ignore[arg-type]
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return [
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partition_html(text=item["content"], **self.unstructured_kwargs)
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for item in f.load_all()
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]
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class CHMParser(object):
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"""Microsoft Compiled HTML Help (CHM) Parser."""
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path: str
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file: "chm.CHMFile"
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def __init__(self, path: str):
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from chm import chm
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self.path = path
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self.file = chm.CHMFile()
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self.file.LoadCHM(path)
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def __enter__(self): # type: ignore[no-untyped-def]
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return self
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def __exit__(self, exc_type, exc_value, traceback): # type: ignore[no-untyped-def]
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if self.file:
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self.file.CloseCHM()
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@property
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def encoding(self) -> str:
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return self.file.GetEncoding().decode("utf-8")
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def index(self) -> List[Dict[str, str]]:
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from urllib.parse import urlparse
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from bs4 import BeautifulSoup
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res = []
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index = self.file.GetTopicsTree().decode(self.encoding)
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soup = BeautifulSoup(index)
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# <OBJECT ..>
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for obj in soup.find_all("object"):
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# <param name="Name" value="<...>">
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# <param name="Local" value="<...>">
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name = ""
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local = ""
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for param in obj.find_all("param"):
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if param["name"] == "Name":
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name = param["value"]
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if param["name"] == "Local":
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local = param["value"]
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if not name or not local:
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continue
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local = urlparse(local).path
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if not local.startswith("/"):
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local = "/" + local
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res.append({"name": name, "local": local})
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return res
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def load(self, path: Union[str, bytes]) -> str:
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if isinstance(path, str):
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path = path.encode("utf-8")
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obj = self.file.ResolveObject(path)[1]
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return self.file.RetrieveObject(obj)[1].decode(self.encoding)
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def load_all(self) -> List[Dict[str, str]]:
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res = []
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index = self.index()
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for item in index:
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content = self.load(item["local"])
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res.append(
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{"name": item["name"], "local": item["local"], "content": content}
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)
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return res
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